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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20b5af986a9faabd8b2c8b82e91f5754bf1e19431ff24c3d2282bef6bd3b77b' 
  AND token = 'amt19RpanYT49ZTByPTC/beGhuKR3CV6cSSO73hlQvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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