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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a207757968e3e27e4df51bb011be239976845a01489332e65a8112c54413d5e' 
  AND token = 'vt8TTPiyxyIlHBNhiwJ3lqOaZplE2dzMoPHjhVjCutQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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