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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84683c442ebd8d3e299e0d6ab65447c37579438c3fe56e574c9e455edb4f074b' 
  AND token = 'lWzdxU27wTqTwz/30R9OU26jahF/pv/dFfaFx21acNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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