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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d902a34852f54b7ee50f88e648fbc36652032aaa6d5861bfc1da37c2c95fc2' 
  AND token = 'FZyYCE6t+3uH0HbWnU1Se7y/G0bZy6KdMNY/v59o+54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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