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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92611f3d1b9f89775b85c60e589c0aab8a801aa9331381292e21190e4ab7159a' 
  AND token = 'dIUV6CQJ5q6odt/5vIlFLgco01oATbTjqHEmF/aclOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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