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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602b3e457638ae468450ac1bc52320ca6a0e7a836352379cd6bb67699ccd5e10' 
  AND token = '4x0Q5oolPBzt2hHC6QgblZ+MDO/y43rS613PaTo4U3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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