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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e058683ebc07b020082a235dd380fbd95678899e77ad3a127e2fb4072b861773' 
  AND token = 'mygZW44FJAQ/h4GnEmYlp7o9ob8P0nOK6lHZnpz/kGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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