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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb31052142436917ad9ee3a0cf27f7958b2932ef9252e382dc2250d3878dd80' 
  AND token = 'nF7hU6GsfdSn4K4jj9uSuGlKGXAaBxzji/39x3hJ4sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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