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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c891433b5a14fe9706441d3d6270f260396fb675e50d0900b18d71e7c3862726' 
  AND token = '5uzx+Ovj11NthIubr+Mi5UwVI6CVUBkpc4MfXxNPiFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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