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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69b08756ef02ff9a37c93b5fb7bea164545b446ea7dc4d198a56de80034aef8' 
  AND token = 'XOpgs/J/g4kda74r114zxLeYXnglrdjn5CRaDcgWFsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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