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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a55bf33dfc6521741669a7679db39adc7c2bfec08b43ae8f87af1fe48a003c' 
  AND token = 'pwe8BecdJOTzWZ0gX2RxRJyIlkayAz0fdnAncUvFRt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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