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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '246adf439a4eb8a3b9c2ec83a932594ea85b3e374f4241da45b92897d6bc4c73' 
  AND token = 'Qi5noLaC4CTBO/eYW/ef7AGNWeI8J0N/9a0x9DsXG8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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