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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2b4efaf21484fb6443ce49292a72209de20c97f285146adf48c83010572da8' 
  AND token = 'O7SNWKhv8iTy6PvYEWlte41jX8bqr8QzcCdgICFXLPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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