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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275d08b1f4aa9b1072585564d96ae62c538775b6f2cb68feacd5a6a8ed2b3b4b' 
  AND token = 'bsauTgZW7eCe37V00BVSjAEnN70PAHYiuQ7MDpDSbkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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