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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32d25b3d29903f04e06d5597ecdf5243a3a84f7966f0cecf45f67d4f8414ce3' 
  AND token = 'mq21LT/KMguc6tDobfMM+VwY4zDTEB+iHarzytjsOfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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