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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c765b0313694e1f21b4c5397405a720ac8520c6fcd8435e14b88474a33da98c5' 
  AND token = 'x3CM/2wMzsG2phREKIvEN3Fmu2BAxpi3gb1MDtqDNFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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