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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f02513f30788a8af8b4754d25ab3e8aeb8c3956ea60138a4bc438bec23c656' 
  AND token = 'u1BDPGnkwA4XWUg9dr5CBGpSuDpxy4+NjNPCUd2lOww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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