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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a2f7acdfb5cb9cd804c5fcb47f86834ff969909849cd7eb36228a82eb62431' 
  AND token = 'of241smcILS7XiFMhUnF1/DIdDkhOF1OJT2+O76L0Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}