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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e39a28782e409d770d4994431618d8869c4b0a03b797daaa1af6de0b34816a' 
  AND token = 'CbEOnwpTwmzeppNpwgDBBIHmu7QxVTj2onL667+l/+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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