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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53d98cd9441e4068ec5a9d540dce9ff41758eb295bd98c6468da54845dd1651' 
  AND token = 'wwU659sACwuxqKeOF5V2o7Hqgb7YtGH6EK+zq79aIPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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