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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb210259f5d8433951c5f5dd36d1419988a013ef8d299afab194b39c2795b7a' 
  AND token = 'ABYBcrKA5l4ZIp5Oa+ZS1dyCUioH2kmAJrB81ozYx7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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