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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbd58e499335956b4302c88d93b1cea13bb19fb55134a22e7703bcd7398906f' 
  AND token = 'vHOZHKqd7QkjMKPNgE07QSfGocAsaimrhs+nmM4mqy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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