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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd49e44825954d4d8d390426e0796751ec258c8fab091923ca5f3f34d2d2aec' 
  AND token = 'IFJNn6nEnKO8THwcpiRlF6GVRDJVnL7YbQMX89/4y1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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