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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4917b21bba809283f3e78be665424fa89935a8355fb0ad01eef78d3e10661a2c' 
  AND token = '9cR7imU+BZ3D7uTuMTqMZl9A/lQd/r78iSGR8ibB0bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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