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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10f16037e5b6ef226163552adee61e58e5b1d8b89bc6cb12cd740a786a4f83d' 
  AND token = 'GcPf/1F8XfBpoAWmo44aSUUboyZsk0ABQ0kRHGOMlao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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