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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e90f750429607080002f78ac2688607aba978474b89b4ead158222b5e89d0e' 
  AND token = 'Q7w2Ysu4YyuuFjgjt5yxYmab7Muh2v5bdecHFDjC4Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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