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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9db3fef1d1ca3d39d5f8b136b557333f7edc00d41c0549daae618218d7dfbd3' 
  AND token = 'lFGKwbogxO85iujr+ttkNvgaBLiwcRzYiMED7+UO9iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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