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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df285c718c54af5822db59d9ad3eff9734de493d9a7bb5553d4be3a47328a0f6' 
  AND token = 'YCA4TH1mY6aXuJAenY8HkfCgrOAL1NIUz6ErZzqilKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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