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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a1c1d7ef8e4dcb9f50a63cc86b2c6a8f034ffd107c73a244b36ea60108da75' 
  AND token = '2BFfieqmZ0kayPurgqLJ2MrcWU1jGpEGIhcoP2ReK9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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