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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570318cdfc14bdf7c88eaed7d102ba0429e6679a979e63c7aa0a80981c9276d3' 
  AND token = 'QN17HPwtpwvMw3kP6rF1HwGLTZJIn37cg1TAM2P/5u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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