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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf323ace5081c25de2a13a1d86976843bc3a0af6ba7c2f0a8911482ae970302' 
  AND token = 'yyh5x0C0501ygpaVi/0gOIS1UWo9xnkemJ1gZZoH0nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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