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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1525347cd8cfaec310ccea3de6d72d94e9697b0dad6f163eb01d78ac271af8fb' 
  AND token = 'pTK+E4hV1r4F++wV/Ctv+UjUy1Dx/FLXEXoOya8wv+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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