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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16fcb55143c19620eff68e92841aed645ccfdb69ad5e78bdb7a69960d0f71a75' 
  AND token = 'iQ//OJOGCtQm0ADgAWAeXbeACIqLwOSv7rDiA9Cs//s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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