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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d828eb85a73813f60550591b1427eac9a62949bb0632422651e4aef9a300db' 
  AND token = 'HB7RrhiCI+YqYkkWT4Dp69yWUJGUyAsJ5gj7a71TH14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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