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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28faafdb5b86f0222d7390b05aa9ad09f590d6b3672f25218b31fce1ab8a56c1' 
  AND token = 'z3IHqYnUYKvmSvy1Fr7aMPqHnnVZ8f8uToFiyQ76FSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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