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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128c6e2e578401f25d4dabe1e62938449d691faed570e136def656eca48576b1' 
  AND token = 't5C/gpACG9vba5VZ/ZgCWfz4IRw9nN7lNky4ZdJIB1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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