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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92e13bb2f7b62b2f742575e494e7ff2933a80ddcc6313c0d1daf5d37195459f' 
  AND token = 'K6SwYW3ldCKAvKbwX7gDa93BeonHSgZxSseR4kbVGEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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