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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bee14b2eb93fec3082f5c59b0358532ad3f1c1b55f5d2a78630742b8df5212' 
  AND token = 'Nu8LhTlQsUBu6/bsmTs/+k0dl/YOejLPMuIFHVd9u7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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