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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc78569f0dd33cf69202c2804c94e776b40e92503c63b6922dca7fe80f65814' 
  AND token = 'nFL5BRGUCgEe3axgs5D3ROJbdtk4iHCi9huh1mw+Tyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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