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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac3b96e9a8d04ed123e19e683a4ca16f094e75374e6d47dec3229dd1e9b24f1b' 
  AND token = 'hsIsH6/ooBWRpxrMEUW37UprFhm+T/wrU3yLAxiLnPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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