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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46637ba284df2401871c51a4712fb78d6b78dbfc440d7a4cbc6fc9be5e961f6e' 
  AND token = '0dsR27FFi9zg3Y2ifoAQCrCLeTEOPg5rIy0EXii2PI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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