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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d51f757b7f8e893f343e0857203a2158accf3039c2ea4cff26a0f972511efb' 
  AND token = 'r/8613/OzVEfF8WyFn37AO/TXdNeZVEPOeXKYsxNaJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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