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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa771ac131d2e4bdf5f263c5f1bc352091aba4d2244255ad0195ae902742ef2' 
  AND token = 'zllRJcbcNbgPDd8j0oSzs9TSrlgXJU+/NVkn84RLMes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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