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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b515a4bd778965ab5d58ca9c1b924e537078c4b883f3d9c8213a45140d608a34' 
  AND token = 'p7dP/mfG2TgEpTE3ecHi5WQLEuwvfafi7/TVwhZvYJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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