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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c125fb716ab426c25672cc9553f024cdf5a279f8886a87b4aac33b12e662941d' 
  AND token = 'IHfG/NTtSm/Zv3ox7ymN0LOCq8oKgFi/5XXtlenSDrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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