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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1832e0b7120ff411b8d1d9c1a29d4bf091f2d8249c7ab4546572950d75c2d3a' 
  AND token = 'ABc+90ZXqjSVYf6bZcOZ8YiUSK6OOx44HNeSgvZRSyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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