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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c2553444702906a21c914eb660c11c328f344be32116d898aea4f7e6b7b5c3d' 
  AND token = '6gi0D93FlPN27DpzfyJz3eeEM4rGBLEmsXbh0RepTW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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