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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913eea212c28b7a57d81b9185855860ba1a12dbae588bbcc7e07f309371ffa40' 
  AND token = 'k2KGobnaH6Q4CVuzqvCGOJ31beQPn2WCZQnGbMHXVq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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