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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ccefbcb196831e59258d7fae92fd18b263c48ac0352bb12447c6b374d058fb' 
  AND token = 'jYYvMJIaZ2ajp4ifOERyjg4CF4J8KW1G2RvalM8RvJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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